Heaf
abbr. heavy-end aviation fuel 重尾航空燃料，航空重油
🗣️ 情景例句
Hello, how are you doing today?
你好， 今天怎么样？
What excuse could he have for being so rude?
他做了那样无理的事，将如何辩解呢？
For our purposes, we are concerned only with one kind of cost----
就我们的目的而言，我们只关心一种费用-